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. o 2 sh t sheet 1. (N wel) J. PARKINSON. ee s SAFETY BLEVATOR Patented Mar. 17, v1896.

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J. PARKINSON. A

SAFETY BVLBVATOR. N@ 556,434. Patented Mar. 17, 1896.

UNITED STATES ATENT Fricij.

JOIIN PARKINSON, OF LOS ANGELES, CALIFORNIA, ASSIGNORr TO THE PACIFIC ELEVATOR COMPANY, OF SAME PLACE.

sAFliTY-'l-:LEVATORl SPECIFICATION forming part of Letters Patent No. 556,434, dated March 17, 1896.

Application led October 24,1894. Serial No. 5Z/6j868. (No model.)

To all whom if may concern:

Be it known that I, JOHN PARKINsoN, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Safety-Elevator, of which the following is a specification.

One object of my invention is to secure superior simplicity of construction.

Another object is to provide a superior safety device which is self-acting and practically instantaneous and at the same time is fully under the control of the operator in the car and can be operated to stop the car at will, and which will readily act to become released when the car is reversed and started up.

Another object is to make a safety appliance absolutely positive in its action, so that the downward movement of the car will cause it to instantly act the moment 'the speed eX- ceeds the limit set and almost immediately stop the car.

Another object is to provide an elevator which can be operated by a slow-running elect-ric motor, thereby avoiding the noise which attends the operation of the rapid motors ordinarily necessary to give the speed for passenger-elevators.

My invention consists in various elements and combinations hereinafter described and claimed.

The accompanying drawings illustrate my invention.

Figure 1 is a` plan showing operative parts of my improved elevator. The racks and parts of the frame are shown in horizontal cross-section, indicated by line l l, Figs. 2, 4L, and 5. Fig. 2 is an elevation of the operative parts, looking between the guides. Fig. 3 is a sectional elevation on line 3 3, Fig. 1, looking to the right. Fig. 4 is a cross-sectional elevation looking to the right in Eig. l from line 4 4. Fig. 5 is a sectional detail of the safety device. Fig. G is a sectional plan on line 6 G, Fig. 5.

My invention embraces the combination of two vertical double-faced racks A A', having their bodies preferably formed of channeliron, two rotating shafts B B1, mounted on a moving frame 2 in a plane at right angles to the racks and provided respectively at their opposite ends with the traveling pinions h h' and b1 b1', geared respectively in the toothed faces of the racks, the pinions of one shaft being opposite the pinions of the other shaft. A suitable motor C is carried by the car, and suitable mechanism connects the motor with the shafts to drive them.

My invention also embraces the combination of a double-faced rack having its body formed of channel-iron, a moving frame ar- -ranged to move along the rack, two traveling pinions mounted on the frame and arranged to mesh respectively with the opposite faces of the rack, and means for simultaneously rotating the pinions in opposite directions.

It also embraces other features and combinations, hereinafter described and claimed.

In the drawings the guides for the opposite sides of the frame consist of the opposite racks, and the pinions are geared therein. l

The mechanism which is used to communicate the power from the motor C to the shafts B B1 consists in the armature worm-shaft D, provided at its ends with the worms d d', the cog-wheels E E', fixed upon the pinion-shafts B B1 and geared with the worms d CZ', respectively, so that the rotation of the worms by the motor will rotate the shafts and thus cause the pinions to travel along the racks.

' The means by which I provide for absolute safety against any objectionable fall of the elevator consists essentially in a sliding lockscrew sleeve F arranged around the pinionshaft B and adapted to slide along and to rotate with such shaft and screw into a stationary nut or screw seat or socket G arranged to receive the sliding screw. Splines f prevent the sleeve from turning on the shaft, and suitable means are arranged to operate the sliding screw-sleeve to slide it along the shaft and bring it into engagement with the screw-seat and thereby cause it to be screwed into the screw-seat. This will stop the rotation of the pinion-shaft and thereby prevent the movement of the cage in the direction which screws the screw into the nut. The

screw is arranged to thus lock the car against its downward motion, and governor appliances are arranged to slide the sliding screw into engagement with its seat when the rapidity of the descent exceeds the desired IOO limit. Each pinion-shaft B B1 is provided with a like locking arrangement. drawings like parts of the two locking arrangements are indicated by like referenceletters. The letters which indicate parts of the locking device applied to the shaft B1 are distinguished by an index.

The governor arrangement which I have invented consists in the rotating governorcarrier II journaled to the frame by suitable means and provided with the carrier-driving cog 71 the beveled wheel I geared with the carrier-driving cog 7L and provided with .the pinion e', which meshes with the wheel J fiXed upon one of the pinion-shafts, B, the weighted governor-arms K K', provided respectively with segmental cogs 7c 7s', a cylinder-gear L meshing with the segmental cogs 7a 7a', the toggle-joint U M', having one of its arms M pivoted to the circular gear L and the other arm pivoted to the frame, and a connecting-rod N connecting the toggle-joint with the lock` screws F through suitable means, such as a yoke O, which embraces both screw-sleeves and in which the screw-sleeves rotate freely. The yoke is connected with the screws, soas to reciprocate them axially, the screws being journaled to revolve in the yoke. One member or arm, M', of the toggle-joint is fixed to the rocking shaft P, which is pivoted to the frame and is provided with the upright lever Q, by which the shaft l? can be operated, thus to throw the toggle-joint member QM' to operate the connecting-rod and cause the screw I*1 to engage with its nut G. The rocking shaft thus forms the pivot by which the toggle-arm M' is pivotcd to the frame.

For the purpose of adjusting the governor for greater or less sensitiveness the lever Q,

is provided with the movable part q, which is adjustable.(by means of the slot q1 and the nut and bolt q2) on the ad justing-arm q',which is fixed on the rocking shaft I. This movable part constitutes an adjusting-weight for the governor.

The carrier II is mounted upon a suitable axle R provided with the ball-bearing 0', soA

thatv the carrier will rotate freely. The axle R is hollow and forms a guide for the cylinder-gear L which reciprocates therein. The axle is provided with the ball-bearing flange o", and the rotating carrier is provided with the internal ball-bearing shoulder h', which is arranged above the flange of the axle, and the antifriction balls -r are interposed between the flange and the shoulder. This contrivance forms a superior hanging ball-bearing for the depending rotating carrier.

In` practical operation the pinion-shafts B B1 are rotated, thus causing the pinions b b' to travel along the vertical racks, and also causing the govern or-earrier II to rotate upon 1 its axle,A In case the car should fall the moment the speed exceeds the limit for which the governor is set the weights of the governor-arms are thrown out and up, thus, through the toothed segments, pulling down In the on the cylinder-gear L and operatingithe toggle-joint to force the yoke O and the lockscrews F F', which it carries, toward the nuts or screw-seats G G. The moment the screws engage the seats they begin to screw thereinto at the same speed of the shafts, and as soon as seated the rotation of the shafts is stopped thereby, and consequently the car is held firmly against further descent. The ear is at perfect liberty, however, to be again drawn up, and when the upward movement takes place the screw is withdrawn from its socket and is only inserted again upon excessive downward speed or upon the operation of the lever Q while the car is descending. The length of the lock-screws F F' determinesl the length of movement of the car after the lock-screws have been started into their seats. Liability of breakage is avoided by making the screws very strong and so short that they are fully seated before the car has traveled any great distance.` This prevents the car from gaining any serious momentum before it is stopped.

By means of the combination of the depend- 1 ing axle R provided with the journal-shoulder fr' and the rotating governor-carrier lI suspended upon such axle and `sustained thereon by the balls r, I am enabled to place the governor beneath the car in the most convenient position for the same.

By means of the double-faced rack and the traveling pinions ZJ' b1 friction between the rack and the traveling pinions is very largely avoided,for the reason that the pinions thus arranged on opposite sides of the rack cause each other to mesh accurately with the rack and prevent any cramping of the bars.

In practice, to adjust the governor to the proper sensitiveness the upper or movable part of the lever is slid to such a position on IOO the adjusting-arm as to sufficiently balance the weight of the weighted governor-arms when the frame is moving at the desired speed, and then when such speed is exceeded the governors will readily act to reciprocate the cylinder-gear.

If it is desired to stop the cage on its downward descent the lever is thrown to force the screw-sleeve into its seat.

Now, having described my invention, what I claim as new, and desire `to secure by Letters Patent, is

l. The combination of a moving frame arranged to move between guides: a rack: a rotating shaft mounted on the frameza traveling pinion fixed upon the shaft and arranged to mesh with and travel along the rack: a screw-sleeve arranged around the shaft and adapted to slide along and rotate with such IIO shaft: a nut fixed to the frame and arranged v to slide therealong and rotate therewith: a screw-seat arranged to receive such sleeve and a governor for automatically sliding the sleeve along the shaft to cause it to engage the screw-seat.

3. The combination of a moving frame arranged to move along a rack: the rack: a rotating pinion-shaft mounted on the frame: a traveling pinion fixed upon the shaft and arranged to mesh with the rack: a screwsleeve arranged around the pinion-shaft and adapted to slide along and rotate with such shaft: a screw-seat arranged to receive the sliding screw-sleeve: a governor-carrier j ournaled to the frame by suitable means: a weighted governor arm provided with a toothed segment: a cylinder-gear meshing with the toothed segment: operative means connecting the cylinder-gear with the screwsleeve to reciprocate it along the shaft and suitable operative' means connecting the shaft with the governor-carrier to rotate the same.

4. The combination of a moving frame arranged to move along a rack: the rack: a rotating pinion-shaft mounted on the frame: a traveling pinion fixed upon the shaft and arranged to mesh with the rack: a screwsleeve arranged around the pinion-shaft and adapted to slide along and rotate with such shaft: a screw-seat arranged to receive the sliding screw-sleeve: the governor-carrier axle fixed to the frame: the governor-carrier journaled on such axle by suitable means; the reciprocating cylinder-gear mounted in the carrier-axle: the toggle-joint having one end pivoted to the frame and the other end pivoted to the cylinder-gear: the connectingrod pivoted at one end to the toggle-joint and at the other end to the sliding screw-sleeve: the weighted governor-arms pivoted to the carrier and provided with the toothed segments meshing with the cylinder-gear: the screw-seat arranged to receive the screwsleeve, and means for connecting the pinionshaft with the governor-carrier to cause the rotation of the shaft to rotate the carrier.

5. The combination of a moving frame arranged to move along a rack: the rack: a rotating pinion-shaft mounted on a frame: a traveling pinion iixed upon the shaft and arranged to mesh with the rack: a screw-sleeve arranged around the pinion-shaft and adapted to slide along and rotate with such shaft: a screw-seat arranged to receive the sliding screw-sleeve: the governor-carrier axle iixed to the frame and provided at one end with the ball-bearing iiange the rotating governorcarrier mounted on such axle and provided with the interior ball-bearing shoulder arranged above the ball-bearing flange: antifriction-balls arranged between the flange and the shoulder: the reciprocating cylindergear mounted in the carrier-axle: the togglejoint having one end pivoted to the frame and the other end pivoted to the cylindergear: the connecting-rod pivoted at one end to the toggle-joint and at the other end to the sliding screw-sleeve: the weighted governorarms pivoted to the carrier and provided with the toothed segments meshing with the cylinder-gear: the screw-seat arranged to receive the screw-sleeve, and means for connecting the pinion-shaft with the governor-carrier to cause the rotation of the shaft to rotate the carrier.

6. The combination of a moving frame arranged to travel along a rack: the rack: a rotating pinion-shaft mounted on the frame: a traveling pinion iixed upon the shaft and arranged to mesh with the rack: a screw-sleeve arranged around the pinion-shaft and adapted to slide along and rotate with such shaft: a screw-seat arranged to receive the sliding screw-sleeve: a governor-carrier axle fixed to the frame and provided at one end with the ball-bearing iiange: the rotating governorcarrier mounted on said axle and provided with the interior ball-bearing shoulder arranged above the ball-bearing iiange: antifriction-balls arranged between the flange and the shoulder reciprocating cylinder-gear mounted in the carrier -axler the rocking shaft journaled to the frame: the toggle-joint having one arm fixed to the rocking shaft and the other arm pivoted to the cylinder-gear: the connecting-rod pivoted at one end to the toggle-joint and at the other end to the sliding screw-sleeve z the weighted governor-arms pivoted to the carrier and provided with toothed segments meshing with the cylindergear: means for connecting the pinion-shaft with the governor-carrier to cause the rotation of the shaft to rotate the carrier: the adj Listing-arm iixed to the rocking shaft, and a suitable weight adjustably mounted on such adjusting-arm.

7. The combination of a moving frame arranged to travel along a rack: the rack: a rotating pinion-shaft mounted on the frame: a traveling pinion iixed upon the shaft and arranged to mesh with the rack: the screwsleeve arranged around the pinion-shaft and adapted to slide along and rotate with such shaft: a screw-seat arranged to receive the sliding screw-sleeve: a rocking-shaft journaled to the frame and connected with the screw-sleeve to reciprocate it along the shaft: and means for rocking the rocking shaft.

8. The combination of the rotating shaft:

vthe screw-sleeve arranged around the shaft:

the screw-seat arranged to receive the sliding screw-sleeve: a rotating governor-carrier: means for rotating the carrier: a cylindergear operatively connected with the screwsleeve to slide the same along the shaft: and a weighted governor-arm pivoted to the carrier and provided with toothed segments meshing with the cylinder-gear.

JOHN PARKINSON.

Vitnesses:

JAMES R. TowNsENn, L. H. TowNsEND, M. G. H. SHnnKs.

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